Standard or tight neck ?

#1 01-22-2003, 07:37 PM

Picked the 6.5-284, going to use Lapua brass, throat for the middle range of the various 140gr bullets. Now, one last question. Should I go with a standard or tight necked chamber? Ray has both and I told him I didn't want to turn necks but I remember reading somewhere on this board that somebody said to go with a ".290 neck" for a 6.5 and that you could turn one neck in about a minute. Would I see a large difference in accuracy between the two? also are there any other benefits besides the potential for greater accuracy? I hope I'm not being a pain in the rear but I trust you guys for helping me with these tough decisions. Thanks again for all your help.
Wayne

#2 01-22-2003, 07:49 PM

I would not go smaller than .292" straight for the throat dimension. The sinclair neck turner with a carbide aftermarket mandrel is the hot ticket. Make sure you tell Sinclair the shoulder angle of the cartridge, so you get the correct angle ground on your cutter.

I think a neck diameter of a loaded round of exactly .2900" is ideal for working with the above reamer dimension of .2920"

Having a turned and properly fitted neck does make a significant improvement in accuracy, and will not work the brass as hard, allowing you to reanneal the necks less often and get better brass life. [img]images/icons/smile.gif[/img]

4mesh063 · #3 02-02-2003, 10:51 PM

Absolutely get the tight neck. Figure on about 10-12 thousanths of wall thickness and .0005 / side clearance. Call K&M Services for the neck turning tools. They have the nicest gizmo going. I own several and there's is the nicest I've seen. Not only a solid carbide mandrel, but the mandrel is also a reamer for removing the "dreaded donut" in your necks.

I can't immagine anyone paying to get a gun chambered and not getting the neck smaller than SAMMI.

#4 02-03-2003, 07:37 PM

Thanks guys. Tight necked it is then.
Wayne

kidcoltoutlaw · #5 11-13-2003, 07:02 AM

where can i find the number or web page for k & m ,thanks,keith

Brent · #6 11-13-2003, 12:59 PM

K&M Services 717-292-3175

I recomend the pilot jack accessory, the fluted reamer/mandrel and the Expandiron die with appropriate mandrel.

Ken's VLD chamfering tool is sweet too.

The power adapter is a must.

Ken's turner does a perfect job, it's a wonder it doesn't cost twice as much too.

kidcoltoutlaw · #7 11-13-2003, 03:25 PM

i ask sinclair int. the same ? they said the only place tight necks help is close range with a light recoil gun.close would be 100 to 300 like the 6ppc is shot at i know some are using it at 1000 yards.he told me the wind and other factors would be more important than cutting necks to get the groups a few .1's smaller,thanks,keith